CPU=cortex-m0plus
TC=arm-none-eabi
CC_OPTS=-fno-builtin -fno-pie -no-pie -nolibc -nostartfiles -mcpu=$(CPU)
ELF2UF2=tools/elf2uf2/elf2uf2
PAD_CHECKSUM=tools/pad_checksum.py

all: firmware.uf2

firmware.uf2: firmware.elf
	$(ELF2UF2) $^ $@

boot2.o: src/boot/boot2.S
	$(TC)-gcc $(CC_OPTS) -c -o boot2.o $^

boot2_crc32.o: boot2.o
	$(TC)-objcopy -O binary boot2.o boot2.bin
	$(PAD_CHECKSUM) -p 256 -s 0xFFFFFFFF boot2.bin boot2_crc32.S
	$(TC)-gcc -c -o boot2_crc32.o boot2_crc32.S

%.o: src/boot/%.S
	$(TC)-gcc $(CC_OPTS) -c -o $@ $^

%.o: src/%.c
	$(TC)-gcc $(CC_OPTS) -c -o $@ $^

%.o: src/libs/%.c
	$(TC)-gcc $(CC_OPTS) -c -o $@ $^

%.o: src/libs/usb/%.c
	$(TC)-gcc $(CC_OPTS) -c -o $@ $^

firmware.elf: boot2_crc32.o main.o crt0.o interrupts.o lock.o gpio.o utils.o clock.o cusb.o cdc-acm.o tty.o
	$(TC)-ld -T linker.ld -Map=$@.map -o $@ $^

clean:
	@rm -f ./*.o ./*crc32.S ./*.elf ./*.bin ./*.map

mrproper: clean
	@rm -f firmware.uf2

.PHONY: clean mrproper